My wife and I met another couple at Rock Bottom Brewing yesterday and they had 2 "firkins" on beer engines, so I ordered an oatmeal stout to see how it tasted. It came very carbonated with nitro-like creamy foam, so I had to ask the server about it. She said that she couldn't lie to me - it was just a warm keg sitting beneath the bar being served on nitro. After having a nice cask pour the night before at a really impressive bar, this left me quite disappointed. I have to say, though, that the regular nitro poured oatmeal stout was good. Just wondering why they would pass off a warm keg served with nitro through a beer engine as coming from a firkin ....anybody who knows enough to order a cask ale would immediately know that this is not that.